Boiler



May 27 1924. 1,495,475

l. J. FRENCH Filed Jan. 11, 1924 2 sheets-sneer 1 /f M ff Fig-1 may 27. x9; 3,495,475

,y l. J. FRENCH Bouma K Filed Jari. 11. 1924 2 sheds-sheen 2 ATTORNEY Patented May 27, i925 IRWN JAMES FRENCH, OF" PITTSBURGH, PENNSYLVANIA, ASSIGNOR 0F THREEm FIFTHS TO ALFRED C. GOOD, 0F WILKINSBURG, PENNSYLVANIA BOILER.

Application led January 11, 1924. Serial No. 625,709..

To all whom it may conceive:

Be it known that I, IRWIN J..Fin-:NC1-r, a citizen of the United' States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Boilers, of which the following is a specification.

My invention relates to steam and hot water boilers and it has especially for its object. the provision of a basel and grate struct-ure in which means are provided for the easy repairor replacement of the grate; the invention further has for its object to provide a base and grate structure for boilers in which the parts maybe assembled without the` use of tools and held in place without the use of bolts and nuts.

In general, the invention has for an object to provide an inexpensive, simple and eicient base and grate structure of the character specified which is especially adapted for use with boilers having water tubes passing through the fire box such as shown in my application filed December 12,

1922, Serial No. 606,368.

Again it is an object of the invention to provide a grate structure of such cooperative arrangen'ient of parts that only the fine ashes resulting from'the combustion can lsift through to the ash box when the grate elements are turned.

A still further object is to provide a grate structure consisting of several clements, each independently operative and each being composed of several sub-units mounted on a' grate bar in such a manner that any one of the units may be replaced or repaired without disturbing the remainder.

In the drawings:

Figure 1 is a cross section of a boiler with my invention in use.

' Figure 2 is a longitudinal section of a portion thereof.

Figure 3 is a detail perspective view of the base, side, front and back plates.

Figure LLis detail perspective view of one of the base-interlocking and grate bar supporting elements.

. Figure 5 is a detail horizontal section of a portion ot the structure.

Figure 6 is a detaill perspective 'view showing elements.

la the drawings, in which like numerals of one of the rate "'s uirrel cave with the faces 7 to receive the dove-tail mem bers 11 which are joined in pairs, as at 10, the pairs being joined by the Agrate bar supports 8, the latter having the notches or recesses 9 for the grate bar bearing ends 16 to rest in.

`When the plates 1, 2 and 3 are brought together and the grate bar supports 8 located with their dove-tail elements 11 in the dovetail recesses provided between the lugs 6 and the boiler body 13 faces 7, the base plates will be held interlocked, as it were, it beingunderstood that in mounting the furnace 1t 1s customary to set the bottom edge of the base 1n concrete as indicated in Figure 1, and this, together with the Vweight of the boiler upon the flange ,4, f

assists in holding the parts interlocked. lV ith this arrangement the plates 1, 2 and 3 will be held 'together without the use of screws, bolts, or other securing devices.

The front wall 1 is provided with grate bar holes or passages 12 through which the grate bars 17 may be inserted, the holes 12 being of a diameter slightly more than the greatest diameter of the grate bars 17 so that these bars may lne-inserted and withdrawn through the holesf12 before or after the 'furnace is assembled.

As shown best in Figures 2 and 6 each grate unit consists of a barA 17 of rectan ular or square cross .section with cylindrical ear ing portions 16-18 at the ends and a squared portion 19 at. the eXtreme or outer end to which a shaker lever (not shown), may be applied in the usual manner. A coller 20 maybe cast or formed on the bar 17 at its front to prevent. the bar being inserted too 'far into the ash pit and'actas a stop against the bar being shoved in when the shaker lever is applied. Gn each bar 17 is located one or more cage elements. These cage elements comprise beads 21 united 'by slats 22, the heads 21 being provided with square or rec tang-ula; openings 2t?, to it en the bar 1.7; A

elli

snilicient'number of cages are assembled on a l? to extend from the iront to the back of the nre box 14 oi. the tru-nace l?) as shown in Figure 2.

The several units ot the grate are ar ranged so as to lie with their peripheries in close approxiination, see Figure l, in order that only the tine ashes may pass. 'lhe slats 22 of each cage are als relatively close together so as to allow the line ashes to pass While holding back the larger coal.

ln practice the shaker lever is applied to the end 19 oi` a bar and the bar turned completely around or merely oscillated in the wall, thus causing the ash to pass down between the slats ot'the bar into the cage and then again between the slats of the bar out o: the cage into the ash pit, as well as to Yfeed down between adjacent grate units.

Should any of the grate units or any section of the grate units burn out or require replacement it is a simple matter to draw out the particolar bar l? ot that unit and drop oil' the detective grate cages. New ones may be then held in position and the nar i7 threaded and the saine restored to its position on the members 8.

:Frein the foregoing it will be seen thatl l. have provided a simple and elliective construction for the purposes intended, which can be manufactured at a low cost and in which replacements can be made Without the necessitfyv oit taking the Jfurnace' apart or of 'using tools for disconnecting the grate elements. The entire operation of changing the ,grate elements can be made with the fire in the tire box and operations can be conducted through the ash pit.

.ln this application l inake no claim `to the furnace structure per se or the combination 'between the furnace body and the grate and hase structure as that constitutes the subject matter ot .my original application hereinbefore referred to,` this application beinga conk tinuation in part of the original application.

From the foregoing description, taken in connection with the accompanying drawings, it is thought the complete construction, operation and advantages of my'invention Will be clear to those skilled in the art to which it relates.

llVhat l claim is:

1. ln a boiler of the character described, an ash pit base composed of opposite end and opposite'side members, one of the end members having an ash pit door and apertnred for the passage of the front journals of the grate bars, the saidends and side sections .raving aligning; dove-tailedclamping portions whereby the said ends and sides are removable, supporting tames each adapted for being located crosswise of and inside its `respectime end of the lase, each of said supporting trames havingr its opposite ends bent inwardly to forni dove-tailed assedic/a heads ttor interlocking with the doveftailed clamping;a portions on the adjacent ends ot the main and end portions ot the basethe said 'trames having socket portions along their upper' edge which constitute hearings for the journals of the grate barsl 1.'

2. ln a boiler ot the character described.y an ash pit hase composed oi' opposite end and opposite side members, one ot the end. members having; an ash pit door and apertured i'or the passage of the front journals of the Igratebars, the said ends and side sections having aligningdore-tailed elain ino; portions whereby the said ends and sides are assembled, supporting trames each adapted 'lor being located cross wise ol a nd inside its respective end oi the base, each ot said supporting` trames haringf its opposite ends bent inwardly to torni dove-tailed clamping' portions on the adjacent ends ol the inain and end portions ot the base, the said frames having socket portions alone' their upper edge which constitute hearings for the journals olf the grate bars, the dove-#tailed portions of the supporting frames being; hollow and vertically slitted.

3. ln a boiler, at base and ,grate structure comprisingr front, back and side base plates .with flanges inwardly projecting in a plane below the upper edge ot the plates, plate interlocking'elements including grate sus taining bars having; bearing portions, one of said base plates having grate bar apertures, grate bars i'nsertible longitudinally through said apertures and adapted to rest Y on said grate bar supports, grate elements threaded on said bars and adapted to turn with the same, said bars beingr freely 'ron tatable in their hearings.

4. A boiler base and grate structure. coinprising front, back and side base plates adapted to constitute a rectangular base, said plates having lugs adjacent to the ends thereoi' constituting dore-tail sockets, grate bar supports having dove-tail elements to cooperate with said sockets, one or' said plates havin; T grate bar openings, grate bars adapted to' be inserted through said openings and to lie in bearing recesses in said grate bar supportss grate element-s threaded, i

on saidgrate bars, each of said grate elements comprising cylindrical slatted cages.

5. A boiler base and grate structure, comprising front, back and side base plates adapted to constitute a rectangular base, said plates having lugs adjacent to the ends 'thereof constituting dove-tail sockets, grate bar supports having dove-tail elements 'to cooperate with said sockets, one of said plates havinpgfgrrate bar openings, grate bars adapted to be inserted through said openings and to lie in bearing recesses in said grate bar supports, grate elements threaded on said bars7 each of said grate elements comprising cylindrical slatted cagess llt) flanged sockets,

each of said cages comprising heads apertured to fit on the bars, and slats connecting adjacent pairs of heads.

6. In boilers, a hollow base that constitutes the ash pit of a boiler and upon which the bottom edge of a boiler body is supported; the ,corners of the base having grate supporting frames each having oppositely disposed pendent members :forinterlockably engaging the Hanged sockets in'the base, said supporting frames havingbearing sockets, a grate struc- 'ture composed of a plurality 'of parallel longitudinal grate-bodies, each of which compris/es cylindrical grate members, each 'of said members having an axial-bore and a grate baron which the cylindrical grate members are slidably engaged, said bar hav! ing opposite end journals for engaging the socket bearings 1n the Vgrate supporting frames and having their front endsshaped to receive a grate shaker for the purposes described. l l

a hollow base that constitutes the ash pit of a boiler and upon which the bottom edge of a boiler body is supported, the, ,corners of the base having flanged sockets, grate supporting frames each having oppositely disposed pendent 7. In boilers,

members for interlockably l engaging the.

flanged sockets in the base, said supporting frames having' bearing sockets, a grate structure composed of a plurality of parallel longitudinal grate bodies, each of which comprises Icylindrical Agrate IRWIN JAMES FRENCH.

members, each of said members having an axial bore and a grate bar on which the cylindrical grate for engaging the v 

